As per an internal memo obtained by Bloomberg, Isaacman claimed that although the company had received several proposals from prospective buyers, none of them had appropriately assessed the business's potential.

Shift4, a publicly traded company with a $7 billion market valuation, has been conducting a sales process lately.

As an early front-runner, Global Payments was one of the "strategic opportunities and alternatives" that Isaacman informed shareholders the business was investigating in November.

According to Reuters earlier this month, Fiserv and Amadeus have emerged as the front-runners.

Shift4 handles more than 200,000 retailers, including hotels and restaurants, and handles over $200 billion in transactions annually.